package com.lagou.mr.homework;


import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.io.IntWritable;
import org.apache.hadoop.io.NullWritable;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.mapreduce.Job;
import org.apache.hadoop.mapreduce.lib.input.CombineTextInputFormat;
import org.apache.hadoop.mapreduce.lib.input.FileInputFormat;
import org.apache.hadoop.mapreduce.lib.output.FileOutputFormat;

import java.io.IOException;

public class SortDriver {
    public static void main(String[] args) throws IOException, ClassNotFoundException, InterruptedException {

        // 1. 获取配置文件对象，获取job对象实例
        Configuration conf = new Configuration();
        Job job = Job.getInstance(conf);
        // 2. 指定程序jar的本地路径
        job.setJarByClass(SortDriver.class);
        //3. 指定Mapper/Reducer类
        job.setMapperClass(SortMapper.class);
        job.setReducerClass(SortReducer.class);
        //4. 指定Mapper输出的kv数据类型
        job.setMapOutputKeyClass(SortBean.class);
        job.setMapOutputValueClass(NullWritable.class);
        //5. 指定最终输出的kv数据类型
        job.setOutputKeyClass(SortBean.class);
        job.setOutputValueClass(NullWritable.class);

        //6. 指定job处理的原始数据路径
        FileInputFormat.setInputPaths(job,new Path(args[0]));
        //7. 指定job输出结果路径
        FileOutputFormat.setOutputPath(job,new Path(args[1]));

        //8. 提交作业
        boolean flag = job.waitForCompletion(true);
        // jvm退出，正常退出0，非0退出
        System.exit(flag ? 0 : 1);
    }

}
